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Eastern Steel Manufacturing Co.,Ltd is a leading manufacturer and distributor of seamless steel pipe, welded steel pipe, OCTG products and fittings. We supply first-step processing, semi-finished parts and finished parts to help our clients meet fabrication requirements beyond their capacity or to improve operations by moving forward the pre-production processing.
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Eastern Steel Manufacturing Co.,Ltd not only improve product production and sales services, but also provide additional value-added services. As long as you need, we can complete your specific needs together.
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The production process of high-pressure boiler tube mainly includes the following key steps:
Raw material selection
1. Material requirements
Selecting high-quality raw materials is the basis for producing high-pressure boiler tubes. Commonly used raw materials include carbon steel pipe, alloy steel pipe, etc. These materials need to have good high temperature resistance, corrosion resistance and high pressure performance. For example, the mild steel pipe can adapt to the working environment of boiler tubes due to their relatively low carbon content.
2. Chemical composition control
The chemical composition of the raw materials must meet the relevant standards to ensure the mechanical properties and corrosion resistance of the final product.
Preparation of tube blanks
1. Hot rolling or cold drawing
The raw materials are processed into tube blanks through processes such as hot rolling or cold drawing. The quality of this step directly affects the subsequent processing and product performance. For tubes that require high-precision dimensions, such as the cold drawing process of precision tube, it is particularly important.
2. Tube blank inspection
The quality of the tube blanks is inspected, including appearance, size, internal defects, etc., to ensure that the tube blanks meet production requirements.
|
Parameter |
Hot Rolling |
Cold Drawing |
|
Billet Entry Temperature |
1,200–1,250 °C |
— |
|
Finish-Rolling Temperature |
≥ 850 °C |
— |
|
Rolling Speed |
0.5–2 m/s |
— |
|
Drawing Annealing |
— |
580–650 °C, hold 30–60 min |
|
Drawing Speed |
— |
0.1–0.5 m/s |
|
Outside Diameter Tolerance |
±0.5% |
±0.15 mm |
|
Wall-Thickness Tolerance |
±0.5% |
±0.10 mm |
Forming Process
1. Die extrusion
The tube billet is extruded into the required shape and size through the die. This step requires the uniformity and thickness accuracy of the tube wall. For some special-purpose pipes, such as oil casing pipe, tubing pup joint and drill pipe, specific size and performance requirements must be met during the forming process.
2. Cutting and trimming
The extruded tube billet is cut and trimmed to obtain a high-pressure boiler tube that meets the length and shape requirements.
Heat treatment
1. Purpose
The heat treatment process can improve the mechanical properties and corrosion resistance of high-pressure boiler tubes.
2. Common processes
Including normalizing, quenching, tempering, etc. Normalizing can eliminate the structural defects of the material and improve the comprehensive performance of the material; quenching can significantly improve the hardness and strength of the material; tempering can eliminate quenching stress and improve the toughness and plasticity of the material.
3. Parameter control
The temperature, time and other parameters in the heat treatment process need to be strictly controlled to ensure the stable performance of the product.
|
Treatment |
Heating Rate (°C/min) |
Soak Temperature (°C) |
Soak Time |
Quench Medium |
Cooling Rate (°C/s) |
Final Hardness (HRC) |
|
Normalizing |
50–100 |
870–920 |
2–4 min per mm of wall thickness |
Air |
5–15 |
20–25 |
|
Quenching |
50–100 |
840–880 |
20–40 |
Water or Oil |
50–200 |
45–55 |
|
Tempering |
30–60 |
550–680 |
60–120 |
Air |
5–15 |
25–30 |
Nondestructive testing
1. Testing methods
Internal defect detection and dimensional measurement of products are performed through X-ray, ultrasonic and other testing methods.
2. Purpose
Ensure that products meet standard requirements, detect and handle internal defects of products in a timely manner, and improve product quality and reliability.
Surface treatment and packaging
1. Surface treatment
The high-pressure boiler tubes are cleaned, rust-removed, and treated to improve the appearance quality and corrosion resistance of the product.
2. Packaging
The treated high-pressure boiler tubes are properly packaged to prevent damage during transportation and storage.
Summary
The production process of high-pressure boiler tubes is a complex and delicate process that requires strict control of process parameters and quality requirements at all links. By introducing advanced equipment and technology, optimizing raw material selection, improving molding processing technology, optimizing heat treatment technology, and strengthening the application of non-destructive testing technology, the production level and competitiveness of high-pressure boiler tubes can be continuously improved.
Read more: How To Weld Boiler Tubes?
E-mail: sales@eastern-steels.com
